Physics

10. Determination of the internal resistance of a cell

  • 00:22 The ammeter must be connected in series. Why is this?
  • 00:32 The cells must be connected in series. Why is this?
  • 00:47 Which variable goes on each axis?

  • cells – e.g. 3 or 4 × 1.5 V “D” type batteries connected in series

  • switch

  • ammeter or multimeter set to A range - ±0.01A

  • various resistor values 0 - 60 Ω

Hazard Risk Control measure

Electrical

Heat – the resistors and wire will get hot if the power is left on.

Students should wear eye protection and should only connect the power when taking measurements.